/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.dync.zxinglibrary.decod;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.Result;
import com.google.zxing.ResultPoint;
import com.google.zxing.ResultPointCallback;

import org.dync.zxinglibrary.R;
import org.dync.zxinglibrary.ScanManager;
import org.dync.zxinglibrary.camera.CameraManager;

import java.util.Collection;
import java.util.Map;

/**
 * This class handles all the messaging which comprises the state machine for capture.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class CaptureActivityHandler extends Handler {

  private static final String TAG = CaptureActivityHandler.class.getSimpleName();

  private final ScanManager scanManager;
  private final DecodeThread decodeThread;
  private State state;
  private final CameraManager cameraManager;

  private enum State {
    PREVIEW,
    SUCCESS,
    DONE
  }

  public CaptureActivityHandler(final ScanManager scanManager,
                                Collection<BarcodeFormat> decodeFormats,
                                Map<DecodeHintType, ?> baseHints,
                                String characterSet,
                                CameraManager cameraManager) {
    this.scanManager = scanManager;
    decodeThread = new DecodeThread(scanManager, decodeFormats, baseHints, characterSet,
      new ResultPointCallback() {
        @Override
        public void foundPossibleResultPoint(ResultPoint point) {
          if(scanManager.scanListener != null) {
            scanManager.scanListener.foundPossibleResultPoint(point);
          }
        }
      });
    decodeThread.start();
    state = State.SUCCESS;

    // Start ourselves capturing previews and decoding.
    this.cameraManager = cameraManager;
    cameraManager.startPreview();
    restartPreviewAndDecode();
  }

  @Override
  public void handleMessage(Message message) {
    if (message.what == R.id.restart_preview) {
      restartPreviewAndDecode();
    } else if (message.what == R.id.decode_succeeded) {
      state = State.SUCCESS;
      Bundle bundle = message.getData();
      Bitmap barcode = null;
      float scaleFactor = 1.0f;
      if (bundle != null) {
        byte[] compressedBitmap = bundle.getByteArray(DecodeThread.BARCODE_BITMAP);
        if (compressedBitmap != null) {
          barcode = BitmapFactory.decodeByteArray(compressedBitmap, 0, compressedBitmap.length, null);
          // Mutable copy:
          barcode = barcode.copy(Bitmap.Config.ARGB_8888, true);
        }
        scaleFactor = bundle.getFloat(DecodeThread.BARCODE_SCALED_FACTOR);
      }
      scanManager.handleDecode((Result) message.obj, barcode, scaleFactor);
    } else if (message.what == R.id.decode_failed) {// We're decoding as fast as possible, so when one decode fails, start another.
      state = State.PREVIEW;
      cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
      //      case R.id.return_scan_result:
//        activity.setResult(Activity.RESULT_OK, (Intent) message.obj);
//        activity.finish();
//        break;
//      case R.id.launch_product_query:
//        String url = (String) message.obj;
//
//        Intent intent = new Intent(Intent.ACTION_VIEW);
//        intent.addFlags(Intents.FLAG_NEW_DOC);
//        intent.setData(Uri.parse(url));
//
//        ResolveInfo resolveInfo =
//            activity.getPackageManager().resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY);
//        String browserPackageName = null;
//        if (resolveInfo != null && resolveInfo.activityInfo != null) {
//          browserPackageName = resolveInfo.activityInfo.packageName;
//        }
//
//        // Needed for default Android browser / Chrome only apparently
//        if (browserPackageName != null) {
//          switch (browserPackageName) {
//            case "com.android.browser":
//            case "com.android.chrome":
//              intent.setPackage(browserPackageName);
//              intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//              intent.putExtra(Browser.EXTRA_APPLICATION_ID, browserPackageName);
//              break;
//          }
//        }
//
//        try {
//          activity.startActivity(intent);
//        } catch (ActivityNotFoundException ignored) {
//          Log.w(TAG, "Can't find anything to handle VIEW of URI");
//        }
//        break;
    }
  }

  public void quitSynchronously() {
    state = State.DONE;
    cameraManager.stopPreview();
    Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
    quit.sendToTarget();
    try {
      // Wait at most half a second; should be enough time, and onPause() will timeout quickly
      decodeThread.join(500L);
    } catch (InterruptedException e) {
      // continue
    }

    // Be absolutely sure we don't send any queued up messages
    removeMessages(R.id.decode_succeeded);
    removeMessages(R.id.decode_failed);
  }

  private void restartPreviewAndDecode() {
    if (state == State.SUCCESS) {
      state = State.PREVIEW;
      cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
    }
  }

  /**
   *
   * @return 返回当前扫描状态，是否可扫描,State.PREVIEW 是可扫描状态
   */
  public boolean  isScanning() {
    if(state == State.PREVIEW){
      return true;
    }
    return false;
  }

}
